Improved impression dental cttp



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C. L. WUESTENBERG, OF'PITTSBURGPENNSYLVANIA.

Letters .Patent No. 90,802, dated June 1, 1869.

The Schedule referred in `these Let/ters Patentand making .part of the name.

To all .whom it ma/y concern Beit known that I, C. L. WUESTENBERG, of Pittsburg, in the county of Allegheny, and State of Pennsylvania, have invented a new and useful Improvement -in that class of dental instruments known as an Impression-Cup, which cup consists of a peculiar-shaped receptacle for holding the wax or plasterusecl for taking an' impression or cast of the`gums, palate, &c.

Heretofore these cups have been made of' metal or porcelain, ,and while answen'ng'the purpose for which they are intended, still they are ohjectionable, from the fact-that where they are`made of metal, the plaster adheres soY iirml y to the cup, after the impression has been taken, that it becomes very diicult to release the cast without great danger-of its breaking. The metal of the cup also imparts to some persons a very peculiar and disagreeable taste, which seems to be an objection to its use.

The porcelain cup, although being perfectly taste# less, 'is of such a friable nature, and the plaster adheres to it so firmly, that there is always danger of cracking the cup in getting it out.

My invention consists in making impression-cups of vulcanized gatta-percha, or vulcanized India rubber, and of -the shape shown in the accompanying drawings, in Which- Figure 1 represents a perspective view of an impression-cup for taking casts of the upper jaw.

Figure 2 is a perspective .View of a cup for taking an impression of the lower jaw.

I make these cups of soft or plastic gutta-percha, v

moulded to the requiredshape, and hardened by the process known as vulcanizing. A

I then 'give the outside, A, of each cup a very `high polish, so that when brought rin contact with Ythe mouth, no unpleasant-sensations are produced.

The inside, B, of' these cups I make or leave rough,`

or withoutany polish whatever. This I do for the purpose of' causing the substance used in taking an impression to adhere with sufficient firmness during the operation of making the cast. Having thus briefly stated the nature of my invention,

.What i claim, is-

An impression-cup, made of the materialherein set forth, said cup having a highly-polished exterior, while the inside is left rough or unpolished, for the purposes stated.

0. L. WUESTENBERG.

Witnesses:

JosIAH W. ELLs, EB. WILLIAMS, Jr. 

